B.Com

You will have to first complete your graduation with more than 50% marks. Only post it, can you purse MBA as MBA is a Masters program. If you find it difficult to complete B.Com then you can try your BA as an external student and complete it via correspondence in 2 years' time.

Since you are giving us options to choose between B.Com (Hons) or BBA so I'm assuming that you are interested in both of the courses equally. Look, Delhi University is well reputed, recognised and everyone gives first priority to DU then comes IP University. ARSD of DU is one of the reputed colleges which is perfect in every aspect.

These are some top colleges for B.Ed in Delhi:
Lady Irwin College
Indira Gandhi National Open University (IGNOU)
Army Institute of Education (AIE)
Guru Gobind Singh Indraprastha University
Siddhi Vinayak College of Science and Higher Education

Yes, there are chances as this year colleges are out with most realist cutoffs. Look for other colleges' cutoff also.

A period of 4-6 months should be sufficient for CAT. Over this time one needs to put in 3-4 hours of daily sincere effort. Self-study and joining of classes for preparation with a lot of doing of mock tests will help you to excel in CAT.

It depends on your interest. If you are interested in government jobs then M.Com would be good for you. Otherwise, if you are interested in business then you can go for MBA.

The candidate must have passed in 10+2.

Candidates who passed/appeared Intermediate or its equivalent examinations are eligible.

In Nizam college, B.Com Admission is based on the marks obtained in 10+2. Candidate must have passed 10+2 from a recognised board.